Would you explain the meaning between "received remote SMTP response 'ok" and "received remote SMTP response 'accepted" ?
Message 8614706 to [email protected] received remote SMTP response 'ok: Messages 1613717078 accepted'.
Message 8512138 to [email protected] received remote SMTP response 'accepted (1116246434)'.
The part in the quotes is the textual part of the response from the remote SMTP server. SMTP does not standardize the explanatory text used in most replies, since the machine readable part of the response is numeric. The two examples you give looked like this during the SMTP exchange:
250 ok: Messages 1613717078 accepted
250 accepted (1116246434)
Since the response code is "250" in both cases, the two messages are equivalent. The explanatory text is meant only for humans.